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Role of Records During the 2011 Off the Pacific Coast of Tohoku Earthquake in Seismic Resistant Design of Nuclear Power Station
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Abstract
The 2011 off the Pacific coast of Tohoku earthquake (Mw9.0) had two main wave phases. They are precious records produced by the series of large earthquake. This phenomenon can be interpreted using the concept of the consolidated-type earthquake. The after-shock (Mw7.1) occurred near the Oshika peninsula on April 7th as the intra plate earthquake. We mainly analyzed the seismic records which were measured at the underground of the Onagawa Nuclear Power Station (NPS). The typical displacement pulse wave was identified by the Ricker wavelet. The directivity of the ground movement was detected. This agrees with the direction of permanent movement measured by GPS system. From the displacement profile from O.P.17.0m to O.P.-128.4m, the uniform deformation of underground soil was found and was evaluated from the shear strain in the underground. The non-stationary Fourier spectra indicated that the maximum amplitude of seismic record (O.P.-8.6m; Onagawa NPS) was comparable with that of the code-specified S2 artificial wave and this fact corresponds to the small damage of the Onagawa NPS. Furthermore the seismic records at the Kashiwazaki-Kariwa NPS during the Niigata-ken Chuetsu-oki earthquake and at the Hamaoka NPS during the Suruga-Bay earthquake in 2009 were compared with the code-specified design motion (S2 artificial wave). The validity of the current code for the NPS is discussed
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